Sharing sound: Avian acoustic niches in the Brazilian Atlantic Forest

Kleyn, Tristan; Kaizer, Mariane da Cruz; Passos, Luiza

doi:10.1111/btp.12907

Cited by 10 publications

(8 citation statements)

References 87 publications

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“…It would be worthwhile to expand the number of sites and recording locations in Costa Rica to further explore the possibility that there is synchronization in the use of acoustic space through interactive communication networks. In contrast to our findings, and in support of the network hypothesis, Tobias et al (2014) and Kleyn et al (2021) reported significant clustering of acoustic signals in a species-rich wet forest bird community in southeast Peru and southeastern Brazil, respectively. However, the temporal scale at which clustering occurred was within 10-min time blocks, much larger than the finer scale of individual songs that we report here.…”

Section: Discussioncontrasting

confidence: 76%

Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities

et al. 2021

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When acoustic signals sent from individuals overlap in frequency and time, acoustic interference and signal masking may occur. Under the acoustic niche hypothesis (ANH), signaling behavior has evolved to partition acoustic space and minimize overlap with other calling individuals through selection on signal structure and/or the sender’s ability to adjust the timing of signals. Alternately, under the acoustic clustering hypothesis, there is potential benefit to convergence and synchronization of the structural or temporal characteristics of signals in the avian community, and organisms produce signals that overlap more than would be expected by chance. Interactive communication networks may also occur, where species living together are more likely to have songs with convergent spectral and or temporal characteristics. In this study, we examine the fine-scale use of acoustic space in montane tropical wet forest bird communities in Costa Rica and Hawai‘i. At multiple recording stations in each community, we identified the species associated with each recorded signal, measured observed signal overlap, and used null models to generate random distributions of expected signal overlap. We then compared observed vs. expected signal overlap to test predictions of the acoustic niche and acoustic clustering hypotheses. We found a high degree of overlap in the signal characteristics (frequency range) of species in both Costa Rica and Hawai‘i, however, as predicted under ANH, species significantly reduced observed overlap relative to the random distribution through temporal partitioning. There was little support for acoustic clustering or the prediction of the network hypothesis that species segregate across the landscape based on the frequency range of their vocalizations. These findings constitute strong support that there is competition for acoustic space in these signaling communities, and this has resulted primarily in temporal partitioning of the soundscape.

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Section: Discussioncontrasting

confidence: 76%

Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities

et al. 2021

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“…Conversely, examining in detail the temporal dynamics of the K statistic and call aggregation, aggregation was stronger in the mature Laurisilva (Meriga), at the beginning of the time-series when Blackbirds dominate the soundscape ( Figure 3B ), and between dawn and dusk ( Figure 3C ). Such dominance of call aggregation might be mediating interspecific competition among species with similar ecological niches, as previously observed in the Amazon rainforest 14 , or simply a synchronized vocal behavior of multiple species 34 . Or perhaps, we are observing the convergence of calls from only a few species, given the low avian diversity of La Gomera compared to tropical rainforests or mainlands 33 , so we might be observing clashes between individuals and/or populations.…”

Section: Resultsmentioning

confidence: 64%

“…Simultaneous processes. Studies have highlighted cases where acoustic partitioning is detected, and others have not 3,34 . Here we point out that both phenomena might coexist in the island, showing different seasonal patterns.…”

Section: Acoustic Aggregation Vs Partitioning Of Calls With Similar F...mentioning

confidence: 99%

“…Spectrum vs. temporal aggregation. Call aggregation has a strong relationship with the spectral composition (MDS2 in Meriga, and MDS1 in El Cedro), indicating that frequency spectral composition might depend on the ecological processes that lead to temporal aggregation of calls with similar frequencies 14 , such as vocal synchronization 34 . Perhaps, depending on the activity of the avian community or its seasonal turnover.…”

Section: Habitat Differences On the Acoustic Assemblagesmentioning

confidence: 99%

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Ecological assembly of natural soundscapes in the Garajonay National Park (Spain)

Ortiz‐Álvarez

García-Puig

Garate

2022

Preprint

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Natural sound contains data about the ecology of animal populations, communities, and the full ecosystem, resulting from a complex evolution and varying according to the environment. Amongst the processes that are hypothesized to explain sound assemblages, or soundscapes, one is the acoustic niche hypothesis: sounds produced by species calling at the same time seek avoid overlapping, leading to an acoustic differentiation of signals. Soundscapes are more complex in the most pristine environments and show responses to habitat degradation and physical perturbations; hence here, we focus on La Gomera, in the Canary Islands (Spain). This island is the only location in Europe where primary cloud forests are well preserved and thrive on an island with varied orography, microclimates, disturbances, and vegetation types. In this article, we adapted a method to quantify the importance of acoustic niche partitioning and also the opposite process: acoustic aggregation. To do so, we explored soundscapes at different temporal scales in forests with variable degrees of perturbation and maturity. A secondary goal of this report is to compare how soundscapes could differ in an area affected by a wildfire, and undisturbed equivalents, in summer in winter, seasons with contrasting temperatures and wind regimes. We conclude that tracking faunal activity and behavior through soundscape monitoring could be a piece of useful complementary information to guide conservation decisions and future restoration efforts in the Garajonay National Park (La Gomera). HIGHLIGHTS: The mature forest and the transitional forest are similar in terms of sound levels, frequencies, and dynamics, although the transitional forest had higher sound levels of the lower frequencies (higher NDSI). The mature forest has stronger and more active assembly mechanisms (i.e., acoustic aggregation and acoustic niche partitioning) and a higher acoustic diversity index (ADI) than the transitional forest. Assembly organizes differently in both locations. In both the mature and the transitional forests, we found an inverse relationship between the ADI and acoustic niche partitioning. At the highest diversities (more frequency bands occupied), the weakest is the temporal avoidance of calls with similar frequencies. The vulnerability of the burned location is highest during the harsh summer, but in winter, it hosts a community very similar to the intact vegetation in terms of ADI and sound levels.

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“…In addition, the overlap in the frequency bandwidth of vocalizations made by sympatric frog species was less than predicted by chance, providing evidence of an acoustic niche (Allen‐Ankins & Schwarzkopf, 2022). However, there has been conflicting support for the Acoustic Niche Hypothesis as one study found synchronized vocal behavior across 10 min bins in multiple Brazilian songbirds (Kleyn et al, 2021). Synchrony of birdsong supports theories of interactive communication networks that benefit species more than acoustic partitioning (Kleyn et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Evidence for acoustic niche partitioning depends on the temporal scale in two sympatric Bornean hornbill species

et al. 2023

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Understanding niche partitioning of closely related sympatric species is a fundamental goal in ecology. Acoustic communication space can be considered a resource, and the acoustic niche hypothesis posits that competition between species may lead to partitioning of communication space. Here, we compare the calling behavior of two sympatric Bornean hornbill species—the rhinoceros hornbill (Buceros rhinoceros) and the helmeted hornbill (Rhinoplax vigil)—to test for evidence of acoustic niche partitioning. Both hornbill species emit calls heard over many kilometers and have similar habitat preferences which is predicted to result in interspecific competition. We collected acoustic data on sympatric populations of both hornbill species using 10 autonomous recording units in Danum Valley Conservation Area, Sabah, Malaysia. We found that there was substantial spectral overlap between the calls of the two species, indicating the potential for competition for acoustic space. To test for evidence of acoustic niche partitioning, we investigated spatial and temporal patterns of calling in each species. Both hornbills were strictly diurnal and called throughout the day, and we were equally likely to detect both species at each of our recorders. We did not find evidence of temporal acoustic avoidance at a relatively coarse timescale when we divided our dataset into 1 h bins, but we did find evidence of temporal acoustic avoidance at a finer timescale when we used null models to compare the observed duration of overlapping calls to the expected amount of overlap due to chance. Abstract in Malay is available with online material.

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Sharing sound: Avian acoustic niches in the Brazilian Atlantic Forest

Cited by 10 publications

References 87 publications

Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities

Timing Is Everything: Acoustic Niche Partitioning in Two Tropical Wet Forest Bird Communities

Ecological assembly of natural soundscapes in the Garajonay National Park (Spain)

Evidence for acoustic niche partitioning depends on the temporal scale in two sympatric Bornean hornbill species

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